Method of making spiral auger stems, bits, and substitutes



METHOD OF MAKINGSPIRAL AUGER STEMS, BITS, AND SUBSTITUTES Filed Aug. 22, 1924 j I I N y C \:i\ j'jfizfldwizr III Patented June 23, .1925.

UNITED STATES FOSTER H. LEIDECKER, 0F MARIETTA, OHIO, ASSIGNOR TO THE LEIDECKER COMPANY, OF MARIETTA, OHIO.

METHOD OF MAKING SPIRAL AUGER STEMS, BITS, AND SUBSTITUTES.

1,543,608 PATENT o-FFlcs.

Application filed August 28, 1924'. Serial No. 734,713.

To all whom it may concern:

Be it known that I, FOSTER H. LEIDEOKER, a citizen of the United States, residing at Marietta, in the county of Washington and State of Ohio, have invented a new and useful Method of Making Spiral Auger Stems, Bits, and Substitutes, of which the following is a specification.

This invention relates to a method of producing spiral auger stems, spiral bits, and spiral substitutes, one of the objects of the invention being to expedite and cheapen the production by avoiding the slow and costly processes heretofore followed and which have required the construction of the articles from cast steel, the planing and milling of the spiral flutes or the formation of the wings or flutes by the use of hand fullers.

With the foregoing and other objects in View the invention consists in first shaping a steel billet 'so as to provide it with longitudinally extending wings after which by the use of suitably shaped dies, a desired twist is imparted to the rolled billet so as to form spiral wings.

The invention also consists in shaping the ends of the billet prior to the twisting operation so as to produce the usual end collars, also the box and pin and wrench square.

The invention also consists in certain novel steps of the method hereinafter more fully disclosed and pointed out in the claim, it being understood that various changes may be made therein without departing from the spirit of the invention as claimed. i i In the accompanying drawings has been shown the means employed for carrying out the several'steps of the method and the produced article has also been illustrated in the different stages of production.

In said drawings Figure 1 is an elevation of a pair of rolls in the process of shaping asteel billet dur ing the first step of the method.

Fig. 2 is an elevation showing a pair of dies that can be'used in .lieu of the rolls for carrying out the first step of the method.

Fig. 3 is a perspective view of a pair of dies used in imparting a twist to the wings. Fig. 4 isa perspective view of the lower die ofa pair.

Fig. 5 is a side elevation of the billet at the completion of the first step of the process.

the process. e

Fig. 8 is a side elevation of the billet when formed into a complete auger stem or substitute.

F ig.'9 is an end elevation on an enlarged scale of the completed article. i

Fig. 10 is a view of a spiral bit. -In carrying out the method a billet of steel is first made cruciform in cross section as shown at 1. This can be done either by passing the billet between two properly shaped die rolls 2 or by forging it between two properly shaped dies 3 operated by air, hydraulic or steam pressure. \Vhere dies are used the billet is fed longitudinally between the dies during successive operations thereof so as to be properly shaped throughout its length. After the billet has been made of cruciform cross section the ends thereof are pressed, forged or otherwise shaped to produce cylindrical collars 4 of such size as to permit the use of the usual box, pin, collarand wrench square. At this stage of the operation the billet has the appearance'disclosed in Fig. ,6. The

next operation consists in subjecting the-bil-' let to successive compressions from a pair of dies designed. to impart a twist to the wings 5 of the billet. For this purpose dies such as shown in Figs. 3 and 4- are employed. The two dies are preferably duplicates and are superposed. Each die includes a block 6 having a longitudinal channel 7 in one face adapted to receive one-half of the partially shaped article. The walls of the channel are rounded and formed in the channel is a fuller 8, extending obliquely throughout the length of the channel. For about half the length of the fuller the transverse area .tions' of the wings are made longer.

this is the preferred construction modifications thereof can be used if desired.

When the billet shown in Fig. 6 is placed with one end portion of its wings between I the dies 6 and saiddies are forced together has been given a partial twist by the dies, is.

shifted longitudinally relative to the dies and held against rotation by the lower member of the dies while the dies are again brought together. Thus a further twist is imparted to the article and the spiral ppr- T liS operation is repeated until the full length of'the winged portion of the article has been acted upon by the dies 6 whereupon the completed auger stem or substitute will be produced as shown in Figs. 8 and 9.

Although I have heretofore described the method ofmaking spiral auger stems and spiral substitutes, it is to be understood that substantially the same method may be employed in making a spiral bit such as shown for example in Fig. 10.

What is claimed is The herein described method of producing spiral auger. stems and the like which consist in positioning between relatively movable dies a steel billet having longitudinal wings, intermittently feeding the billet longitudinally between the dies, each longitudinal movement being equal to or less than the length of the die, the billet v being held by'one of the die members against rotation at the completion of each intermittent movement, and subjecting the wings of the billet to pressure from the dies during pauses between the movements of the billet, thereby to successively twist the wings of the billet progressively from one end to the other thereof.

In testimony that I claim the foregoing as my own, I have hereto ailixedmy signature in the presence of two witnesses.

FOSTER H. .LEIDECKER. lVitnesses GEORGE J oHNsTuN, HARRY M. Sormrnu. 

